Description:
A vulnerability was reported in Lotus Domino. A remote user can cause denial of service conditions.

A remote user can send a specially crafted vCal meeting request via SMTP to cause the target routing server (nrouter.exe) to consume all available CPU resources. This will prevent delivery of all mail.

The affected mail must be removed from the queue to cause the system to return to normal operations.

Symantec reported this vulnerability.

[Editor's note: This vulnerability was original referenced by IBM in July 2005.]

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Symantec Vulnerability Research
http://www.symantec.com/research
Security Advisory
Advisory ID : SYMSA-2006-006
Advisory Title : Lotus Domino SMTP Based Denial of Service
Author : Ollie Whitehouse (ollie_whitehouse@symantec.com)
Release Date : June 27, 2006
Application : Lotus Notes / Domino
Platform : Multiple supported platforms.
Severity : Remote Denial-of-Service
Vendor status : IBM has resolved this issue in Domino 6.5.4 FP1,
6.5.5 and 7.0
CVE Candidate : CAN-2006-0119
Reference : http://www.securityfocus.com/bid/18020
Overview:
Lotus Domino is a client/server product designed for
collaborative working environments. Domino is designed
for e-mail, scheduling, instant messaging and data
driven applications.
There exists a Denial-of-Service condition within
NROUTER when parsing meeting requests. The result of
which is that no external or internal mail will be
delivered during the processing of the malformed
message.
This attack can be triggered from the Internet via
standard mail protocols.
Details:
When a malformed meeting request (vCal) is sent to a
Lotus Domino based host via SMTP the routing server
(nrouter.exe) will consume 100% of the CPU.
In Symantec's testing on an Intel PIII with 256MB of
RAM, 24 hours of procesing did not clear the message.
Shutting down the server and restarting it does not
resolve the problem due to the message remaining in
the mail queue. The result of which is that the server
returns to consuming 100% of the CPU.
As stated above all e-mail functionality on the server
will be disabled while the message is being processed.
Vendor Response:
This issue was reported as 'SPR# KSPR699NBP' and has
been resolved in Domino 6.5.4 FP1, 6.5.5 and 7.0. For
more information, please see technote #1211952.
www.ibm.com/support/docview.wss?rs=475&uid=swg21211952
IBM recommends that instances of Domino are upgraded
to at least 6.5.4 FP1, 6.5.5 or 7.0 in order to ensure
this vulnerability is mitigated.
Recommendation:
Follow your organization's testing procedures before
applying patches or upgrading software. See IBM's
instructions as to which versions of Domino resolve
this Denial-of-Service vulnerability.
Common Vulnerabilities and Exposures (CVE) Information:
The Common Vulnerabilities and Exposures (CVE) project has
assigned the following names to these issues. These are
candidates for inclusion in the CVE list (http://cve.mitre.org),
which standardizes names for security problems.
CAN-2006-0119
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Copyright (c) 2006 by Symantec Corp.
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